Is it possible to write a 'generics' version of a closure? I have some simple athematic that I have to perform on different int types
@ashthespy I've read a couple of books on rust and never saw anything like that, so I don't think there is.
Any work-around I can think of negates the benefits of a closure, like capturing the surrounding environment. If you don't need that you could just write a generic function and use that.
that would be an option indeed. Thanks!
@ashthespy unfortunately closure inplements the first
If closure is passed as argument to generic method then it implements
If you bind closure to variable and call it later it implements one of
Closure never implements more than one
Fn* trait bound it encounters.If closure is passed as argument to generic method then it implements
Fn bound of the type parameter.If you bind closure to variable and call it later it implements one of
Fn* depending on how you call it. Only first call counts.Closure never implements more than one
Fn* trait (except HKLB).
And since implementing
Fn* trait for generic argument is the same as implement multiple Fn* traits for different argument types - closure can't do it either.
Hello, I need some help here solving a problem with closures. I have this:
let mut varegrupper: Vec<Varegruppe> = vec![];
let future = SqlConnection::connect(conn_str).and_then(|conn| {
conn
.simple_query("SELECT * from nxDw.dbo.Varegr")
.for_each(|row: QueryRow| {
let r1: &str = row.get(0);
let r2: &str = row.get(1);
let r3: &str = row.get(2);
&varegrupper.push(Varegruppe::new(r1, r2, r3));
Ok(())
})
});
match current_thread::block_on_all(future) {
Ok(_) => Ok(varegrupper),
Err(e) => Err(e),
}
}And i get a cannot move out ofvaregrupperbecause it is borrowed error. I know how that works, but I see no way of solving it...
If I create a "scope" around the closure, then
futures goes out of scope before the final match...